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generative modeling for Rhino

JP Mays
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• Charlotte, NC
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## JP Mays's Discussions

### How to find normals at intersection of a curve and surface?5 Replies

Hi all, interesting problem here.I have a grid of points, which define lines going down in the Z direction.  I then find the  intersections of these with a topographical surface below (a Brep,…Continue

Started this discussion. Last reply by Hannes Löschke Dec 17, 2012.

### Removing items from a list by Smalller Than4 Replies

Hi guys,Relative noob to Grasshopper here (I'm taking an intro course at university right now, but still in the dark on a lot of how this works).  I'm working on an attractor pattern, and would like…Continue

Started this discussion. Last reply by JP Mays Nov 8, 2012.

# JP Mays's Page

## Latest Activity

"Since your curves are all lines, SCX (mathematical Surface-Line-Intersection) would be more appropriate and lines don't need to physically intersect the surface any more. Explode your BRep (since it is a kind of flat surface anyway) to get all…"
Dec 17, 2012
"JP,  I think the problem is that the Surface CP will return the closest point on EVERY surface to each specific point from which you are searching. From this longer list, you need to find the point that has the smallest distance as this will…"
Dec 14, 2012
"Chris, this is what I am trying to achieve, but the problem is the Closest point returns too many values, not equal to the number of points in the intersection. My surface started as a mesh that I imported from Revit, and then converted to a…"
Dec 14, 2012
Dec 14, 2012
"Hi Mays, Can you post/draw a screenshot of what you want to achieve?Thank you."
Dec 14, 2012
JP Mays posted a discussion

### How to find normals at intersection of a curve and surface?

Hi all, interesting problem here.I have a grid of points, which define lines going down in the Z direction.  I then find the  intersections of these with a topographical surface below (a Brep, collection of surfaces).  How can I find the normals at these intersections, so that if I distribute a planar object to these points they will orient to the topography?  I have tried Surface CP, and Evaluate Surface, but they return results for each surface in the Brep, not at the specific…See More
Dec 13, 2012
"Thanks Chris, this was just what I needed. JP"
Nov 8, 2012
"No apologies necessary. "
Nov 7, 2012
"Hi JP,From what you said, this is what you need: There is just one problem: In order for attractor/repeller to work correctly it needs to have the same number of objects scales, as objects . But you want to have less object scales than actual…"
Nov 7, 2012
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Nov 7, 2012
JP Mays posted a discussion

### Removing items from a list by Smalller Than

Hi guys,Relative noob to Grasshopper here (I'm taking an intro course at university right now, but still in the dark on a lot of how this works).  I'm working on an attractor pattern, and would like to filter a list to remove items that equal 1.  For example, I have remapped a list which determines the scale of my 690 objects (from 0.1 - 1.0), and I want to disclude all of the 1.0s.  I stumbled upon the Smaller Than component, which gives me a True/False list, but I simply want my list to…See More
Nov 7, 2012
JP Mays is now a member of Grasshopper
Sep 27, 2012

## Profile Information

Company, School, or Organization
UNC Charlotte

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